/Engine/Plugins/MovieScene/MovieRenderPipeline/Source/MovieRenderPipelineCore/Public/Graph/MovieGraphDataTypes.h
Getter for the Output Frame. Make sure you call AllocateNewOutputFrame_GameThread first, otherwise this trips a check.
[FMovieGraphOutputMergerFrame](API\Plugins\MovieRenderPipelineCore\Graph\FMovieGraphOutputMergerFrame) & GetOutputFrame_GameThread ( int32 InFrameNumber )